What are antioxidants?
Antioxidants are substances that prevent and resist the oxidation process of substances. There are many types, including low molecular weight and high molecular weight; natural and synthetic.
Classification of antioxidants
1. Primary antioxidant
Typical primary antioxidants include the following two categories:
Hindered phenolic antioxidants: the most widely used class of primary antioxidants. The antioxidant effect is generally weaker than that of amine antioxidants, but it is not polluting. It is mainly used in plastics and light-colored rubber products. Many well-known products such as 1076 and 1010 belong to this category. 2. Auxiliary antioxidants are mainly thioesters such as thiodipropionate and phosphite. They are mainly used in polyolefins and used together with phenolic antioxidants to produce synergistic effects. Phosphite is the most widely used auxiliary antioxidant, typical products such as 168. Sulfides are another class of secondary antioxidants, typical products such as DLTDP and DSTDP.
Aromatic amine antioxidants: Amine antioxidants are almost all derivatives of aromatic secondary amines, mainly including diaryl secondary amines, p-phenylenediamines, ketoneamines, and aldehyde amines. Most of them have good anti-oxidation performance, but are prone to color stains, and are mainly used in the rubber industry and polyurethane products.
3. When the metal passivator polymer is in contact with heavy metals, the catalytic action of heavy metal ions will cause the polymer to undergo a degradation reaction. For example, the core wire of the cable material is copper, which is often Copper damage is caused, so it is necessary to add a copper ion passivator, and the metal passivator can greatly improve the stability of the polymer.
Label:     antioxidant  hindered phenolic antioxidant  aromatic amine antioxidant
